York serial number lookup

Spaces and dashes are accepted. Check O/0 and I/1, and keep any leading zeros.

Model and known context (optional)

Checks ENERGY STAR model records and searches manuals separately from the serial. Certification records do not establish this unit’s manufacture date.

Known product context (optional)

Choose a system only when it matches the product family and its documentation. A purchase year or a manual’s publication date does not establish a manufacturing date.

Parts and warranty records (optional)

The guide distinguishes a four-letter prefix plus six digits used in 1971–October 2004 from the later plant/year/month/year prefix and six-digit sequence.

Model and known context (optional)

Checks ENERGY STAR model records and searches manuals separately from the serial. Certification records do not establish this unit’s manufacture date.

Serial guidance and coverage

Look for the model/serial data-plate sticker on the exterior or inside the unit; the guide does not give one universal location.

  • Serial dates and format matches do not establish current warranty coverage, purchase date, authenticity or ownership.
  • A missing equipment records result does not establish an invalid serial number; manufacturer and model coverage vary.
  • The pre-2004 month table omits December while the newer table includes N=December. Preserve year ambiguity and retain the existing verified York decoder rules rather than replacing them with an incomplete guide table.

Full York lookup & label guide · Manuals+